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                <h2 id="day3"><a href="#day3" class="headerlink" title="day3"></a>day3</h2><p>mybatis的深入和多表<br>mybatis连接池<br>mybatis事务控制及设计方法<br>mybatis的多表查询</p>
<span id="more"></span>

<ol>
<li><p>实际开发中都会使用到连接池，它可以减少我们获取连接所消耗的时间<br> 连接池就是用于存储连接的一个容器，容器其实就是一个集合对象，待机和必须是线程安全的，不能两个线程拿到统一连接<br> 该集合还必须实现队列的特性：先进先出</p>
</li>
<li><p>mybatis中的连接池<br> mybatis连接池提供了3种方式的配置：<br> 配置的位置：主配置文件SqlMapConfig.xml中的dataSource标签,type属性表示采用何种连接池方式<br> type属性:<br>     POOLED  采用传统的javax.sql.DataSource规范中的连接池,mybatis中有针对规范的实现<br>     UNPOOLED  采用传统的获取连接方式,虽然也实现Javax.sql.DataSource接口,但是并没有使用池的思想<br>     JNDI    采用服务器提供的JNDI技术实现,来获取DataSource对象,不同的服务器所能拿到的DataSource是不一样的<br>             注意:如果不是web或者maven的war工程,是不能使用的
     </p>
</li>
<li><p>mybatis中的事务<br> 什么是事务<br> 事务的四大特性ACID<br> 不考虑隔离性会产生的3个问题<br> 解决方法:四种隔离级别</p>
<p> 它是通过sqlsession对象的comit方法和rollback方法实现事务的提交和回滚</p>
<p> sqlSession &#x3D; factory.openSession(true);&#x2F;&#x2F;可以自动提交,不用再写sqlSession.commit()<br> 一个事务中要实现多次交互时,不推荐自动提交,控制不住</p>
</li>
</ol>
<p>mybatis中的动态sql语句</p>
<pre><code>1. if标签

/**
 * 根据传入参数条件查询用户
 * @param user 查询的条件，有可能有用户名，有可能有年龄等等
 *
 */
List&lt;User&gt; findUserByCondition(User user);
</code></pre>
<hr>
<pre><code>&lt;!--根据条件查询用户--&gt;
&lt;select id=&quot;findUserByCondition&quot; parameterType=&quot;com.sqtian.domain.User&quot; resultType=&quot;com.sqtian.domain.User&quot;&gt;
    select * from hero where 1=1
    &lt;if test=&quot;name != null&quot;&gt;
        and name = #&#123;name&#125;
    &lt;/if&gt;
    &lt;if test=&quot;age != null&quot;&gt;
        and age = #&#123;age&#125;
    &lt;/if&gt;
&lt;/select&gt;
</code></pre>
<hr>
<h2 id="或者-select-from-hero-and-name-x3D-name-and-age-x3D-age"><a href="#或者-select-from-hero-and-name-x3D-name-and-age-x3D-age" class="headerlink" title="或者                select * from hero                                    and name &#x3D; #{name}                                        and age &#x3D; #{age}                        "></a>或者<br>    <!--根据条件查询用户--><br>    <select id="findUserByCondition" parameterType="com.sqtian.domain.User" resultType="com.sqtian.domain.User"><br>        select * from hero<br>        <where><br>            <if test="name != null"><br>                and name &#x3D; #{name}<br>            </if><br>            <if test="age != null"><br>                and age &#x3D; #{age}<br>            </if><br>        </where><br>    </select></h2><pre><code>@Test
public void testFindByCondition()&#123;
    User user = new User();
    user.setName(&quot;new&quot;);
    user.setAge(18);
    List&lt;User&gt; users = userDao.findUserByCondition(user);
    for (User u : users) &#123;
        System.out.println(u);
    &#125;
&#125;
</code></pre>
<hr>
<pre><code>2. 多个参数
</code></pre>
<p>如 select * from hero where id in(1,3,5); 如何实现<br>利用queryVo 添加	private List<Integer> ids;</p>
<pre><code>/**
 * 根据QueryVo中的id集合查询用户
 *
 *
 */
List&lt;User&gt; findUserInIds(QueryVo vo);
</code></pre>
<hr>
<pre><code>&lt;!--根据queryVo中的id集合查询--&gt;
&lt;select id=&quot;findUserInIds&quot; resultType=&quot;User&quot; parameterType=&quot;QueryVo&quot;&gt;
    select * from hero
    &lt;where&gt;
        &lt;if test=&quot;ids != null and ids.size()&gt;0&quot;&gt;
            &lt;foreach collection=&quot;ids&quot; open=&quot;and id in(&quot; close=&quot;)&quot; item=&quot;id&quot; separator=&quot;,&quot;&gt;
                #&#123;id&#125;
            &lt;/foreach&gt;
        &lt;/if&gt;
    &lt;/where&gt;

&lt;/select&gt;
</code></pre>
<hr>
<pre><code>@Test
public void testFindInIds()&#123;
    //根据queryVo对象的条件来查询
    QueryVo queryVo = new QueryVo();
    List&lt;Integer&gt; list = new ArrayList&lt;Integer&gt;();
    list.add(1);
    list.add(3);
    list.add(5);
    queryVo.setIds(list);
    List&lt;User&gt; users = userDao.findUserInIds(queryVo);
    for (User u : users) &#123;
        System.out.println(u);
    &#125;
&#125;
</code></pre>
<hr>
<p>4.mybatis中的多表查询<br>    表之间的关系有几种:<br>        一对多<br>        多对一<br>        一对一<br>        多对多</p>
<pre><code>示例: 用户和账户
    一个用户可以有多个账户
    一个账户只能属于一个用户(多个账户也可以属于同一个用户)
    
    
步骤: 
    1. 建立两个表: 用户表,账户表
        让用户表和账户表之间具备一对多的关系: 需要使用外键在账户表中添加
    2. 建立两个实体类: 用户实体类和账户实体类
        让用户和账户的实体类能体现出来一对多的关系
        
    3. 建立两个配置文件
        用户的配置文件
        账户的配置文件
    4. 实现配置:
        当我们查询用户时,可以同时得到用户下所包含的账户信息
        当我们查询账户时,可以同时得到账户的所属用户信息
        
    select h.*,a.id as aid,a.uid,a.balance from account a,hero h where h.id=a.uid;
</code></pre>
<h2 id="多对一"><a href="#多对一" class="headerlink" title="多对一"></a>多对一</h2><p>public class Account implements Serializable {</p>
<pre><code>private Integer id;
private Integer uid;
private String name;
private Double balance;

@Override
public String toString() &#123;
    return &quot;Account&#123;&quot; +
        &quot;id=&quot; + id +
        &quot;, uid=&quot; + uid +
        &quot;, name=&#39;&quot; + name + &#39;\&#39;&#39; +
        &quot;, balance=&quot; + balance +
        &#39;&#125;&#39;;
&#125;

public Integer getId() &#123;
    return id;
&#125;

public void setId(Integer id) &#123;
    this.id = id;
&#125;

public Integer getUid() &#123;
    return uid;
&#125;

public void setUid(Integer uid) &#123;
    this.uid = uid;
&#125;

public String getName() &#123;
    return name;
&#125;

public void setName(String name) &#123;
    this.name = name;
&#125;

public Double getBalance() &#123;
    return balance;
&#125;

public void setBalance(Double balance) &#123;
    this.balance = balance;
&#125;
</code></pre>
<h2 id=""><a href="#" class="headerlink" title="}"></a>}</h2><p>public class AccountUser extends Account {<br>    private String name;<br>    private Integer age;</p>
<pre><code>@Override
public String toString() &#123;
    return super.toString()+&quot;     AccountUser&#123;&quot; +
        &quot;name=&#39;&quot; + name + &#39;\&#39;&#39; +
        &quot;, age=&quot; + age +
        &#39;&#125;&#39;;
&#125;

@Override
public String getName() &#123;
    return name;
&#125;

@Override
public void setName(String name) &#123;
    this.name = name;
&#125;

public Integer getAge() &#123;
    return age;
&#125;

public void setAge(Integer age) &#123;
    this.age = age;
&#125;
</code></pre>
<h2 id="-1"><a href="#-1" class="headerlink" title="}"></a>}</h2><p>public interface IAccountDao {<br>    &#x2F;**<br>     * 查询所有账户,同时还有获取当前账户的所属用户信息<br>     * @return<br>     *&#x2F;<br>    List<Account> findAll();</p>
<pre><code>/**
 * 查询所有账户,并且带有用户名称和地址信息
 * @return
 */
List&lt;AccountUser&gt; findAllAccounts();
</code></pre>
<h2 id="-2"><a href="#-2" class="headerlink" title="}"></a>}</h2><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sqtian.dao.IAccountDao">

<pre><code>&lt;!--配置查询所有  com.sqtian.domain.--&gt;
&lt;select id=&quot;findAll&quot; resultType=&quot;Account&quot;&gt;
    select * from account;
&lt;/select&gt;

&lt;!--配置查询所有--&gt;
&lt;select id=&quot;findAllAccounts&quot; resultType=&quot;AccountUser&quot;&gt;
    select a.*,h.name,h.age from account a ,hero h where h.id=a.uid;
&lt;/select&gt;
</code></pre>
</mapper>
-------------------------------------------------------------------------------------


<p>实际上常用的方法</p>
<p>从表实体应该包含一个主表实体的对象引用<br>在封装account时希望同时也将user封装</p>
<p>public class Account</p>
<pre><code>//从表实体应该包含一个主表实体的对象引用
private User user;

public User getUser() &#123;
    return user;
&#125;

public void setUser(User user) &#123;
    this.user = user;
&#125;
</code></pre>
<hr>
<mapper namespace="com.sqtian.dao.IAccountDao">

<pre><code>&lt;!--定义封装account和user的resultMap--&gt;
&lt;resultMap id=&quot;accountUserMap&quot; type=&quot;account&quot;&gt;
    &lt;id property=&quot;id&quot; column=&quot;aid&quot;&gt;&lt;/id&gt;
    &lt;result property=&quot;uid&quot; column=&quot;uid&quot;&gt;&lt;/result&gt;
    &lt;result property=&quot;balance&quot; column=&quot;balance&quot;&gt;&lt;/result&gt;
    &lt;!--一对一的关系映射,配置封装user的内容--&gt;
    &lt;association property=&quot;user&quot; column=&quot;uid&quot; javaType=&quot;com.sqtian.domain.User&quot;&gt;
        &lt;id property=&quot;id&quot; column=&quot;id&quot;&gt;&lt;/id&gt;
        &lt;result property=&quot;name&quot; column=&quot;name&quot;&gt;&lt;/result&gt;
        &lt;result property=&quot;age&quot; column=&quot;age&quot;&gt;&lt;/result&gt;
        &lt;result property=&quot;weight&quot; column=&quot;weight&quot;&gt;&lt;/result&gt;
        &lt;result property=&quot;height&quot; column=&quot;height&quot;&gt;&lt;/result&gt;

    &lt;/association&gt;
&lt;/resultMap&gt;

&lt;!--配置查询所有  resultMap引用映射--&gt;
&lt;select id=&quot;findAll&quot; resultMap=&quot;accountUserMap&quot;&gt;
</code></pre>
<!--        select * from account;-->
<pre><code>    select h.*,a.id as aid,a.uid,a.balance from account a,hero h where h.id=a.uid;
&lt;/select&gt;
</code></pre>
</mapper>
--------------------------------------------------------

<pre><code>@Test
public void testFindAll()&#123;
    //5.执行查询所有的方法
    List&lt;Account&gt; accounts = accountDao.findAll();
    for (Account account : accounts) &#123;
        System.out.println(&quot;每一个账户的信息&quot;);
        System.out.println(account);
        System.out.println(account.getUser());
    &#125;


&#125;
</code></pre>
<hr>
<h2 id="一对多查询操作"><a href="#一对多查询操作" class="headerlink" title="一对多查询操作"></a>一对多查询操作</h2><p>select * from hero h left outer join account a on h.id&#x3D;a.uid</p>
<hr>
<p>public class User<br>    &#x2F;&#x2F;一对多关系映射,主表实体应该包含从表实体的集合引用<br>    private List<Account> accounts;</p>
<pre><code>public List&lt;Account&gt; getAccounts() &#123;
    return accounts;
&#125;

public void setAccounts(List&lt;Account&gt; accounts) &#123;
    this.accounts = accounts;
&#125;
</code></pre>
<hr>
<p>IUserDao</p>
<pre><code>&lt;resultMap id=&quot;userAccountMap&quot; type=&quot;user&quot;&gt;
    &lt;id property=&quot;id&quot; column=&quot;id&quot;&gt;&lt;/id&gt;
    &lt;result property=&quot;name&quot; column=&quot;name&quot;&gt;&lt;/result&gt;
    &lt;result property=&quot;age&quot; column=&quot;age&quot;&gt;&lt;/result&gt;
    &lt;result property=&quot;weight&quot; column=&quot;weight&quot;&gt;&lt;/result&gt;
    &lt;result property=&quot;height&quot; column=&quot;height&quot;&gt;&lt;/result&gt;
    &lt;!--配置user对象中accounts集合的映射--&gt;
    &lt;collection property=&quot;accounts&quot; ofType=&quot;Account&quot;&gt;
        &lt;id property=&quot;id&quot; column=&quot;aid&quot;&gt;&lt;/id&gt;
        &lt;result property=&quot;uid&quot; column=&quot;uid&quot;&gt;&lt;/result&gt;
        &lt;result property=&quot;balance&quot; column=&quot;balance&quot;&gt;&lt;/result&gt;

    &lt;/collection&gt;

&lt;/resultMap&gt;

&lt;!--配置查询所有  com.sqtian.domain.--&gt;
&lt;select id=&quot;findAll&quot; resultMap=&quot;userAccountMap&quot;&gt;
</code></pre>
<!--        select * from hero;-->
<pre><code>    select * from hero h left outer join account a on h.id=a.uid
&lt;/select&gt;
</code></pre>
<hr>
<pre><code>@Test
public void testFindAll()&#123;
    //5.执行查询所有的方法
    List&lt;User&gt; users = userDao.findAll();
    for (User user : users) &#123;
        System.out.println(&quot;---每个用户的信息---&quot;);
        System.out.println(user);
        System.out.println(user.getAccounts());
    &#125;
&#125;
</code></pre>
<hr>
<h2 id="多对多"><a href="#多对多" class="headerlink" title="多对多"></a>多对多</h2><p>示例: 用户和角色<br>    一个用户可以有多个角色<br>    一个角色可以赋予多个用户</p>
<pre><code>步骤: 
    1. 建立两个表: 用户表,角色表
        让用户表和角色表之间具备多对多的关系: 需要使用中间表，中间表中包含各自的主键，在中间表中是外键
        
    2. 建立两个实体类: 用户实体类和角色实体类
        让用户和角色的实体类能体现出来多对多的关系
        各自包含对方一个集合的引用
        
    3. 建立两个配置文件
        用户的配置文件
        角色的配置文件
    4. 实现配置:
        当我们查询用户时,可以同时得到用户下所包含的角色信息
        当我们查询账户时,可以同时得到角色的所属用户信息
</code></pre>
<p>CREATE TABLE role(<br>    id INT(11) NOT NULL COMMENT’编号’,<br>    ROLE_NAME VARCHAR(32)DEFAULT NULL COMMENT’角色名称’,<br>    ROLE_DESC VARCHAR(60)DEFAULT NULL COMMENT’角色描述’<br>);</p>
<p>INSERT INTO role VALUES(1,’无名剑主’,’划破时代黑暗的破势之剑’),(2,’东灵剑主’,’飘逸灵巧的睿智之剑’),(3,’月白剑主’,’优雅高贵的魅力之剑’),(4,’红云剑主’,’桀骜狂放的狂道之剑’),(5,’紫霄剑主’,’顺应时势的天道之剑’);</p>
<p>SELECT * FROM role;</p>
<p>CREATE TABLE user_role(<br>    uid INT(11) NOT NULL COMMENT’用户编号’,<br>    rid INT(11) NOT NULL COMMENT’角色编号’,<br>    PRIMARY KEY (uid,rid),<br>    KEY FK_Reference_10 (rid),<br>    CONSTRAINT FK_Reference_10 FOREIGN KEY (rid) REFERENCES role(id),<br>    CONSTRAINT FK_Reference_9 FOREIGN KEY (uid) REFERENCES hero(i<code>role``user_role``role``hero``user_role``hero</code>d)<br>);<br>INSERT INTO user_role(uid,rid) VALUES (1,5),(2,1),(3,1),(4,2),(5,4),(6,3),(13,4);</p>
<p>SELECT * FROM user_role;</p>
<hr>
<p>多对多<br>查询角色的同时获取用户信息<br>select h.*,r.id as rid,r.role_name,r.role_desc from role r<br>left outer join user_role ur on r.id&#x3D;ur.rid<br>left outer join hero h on ur.uid&#x3D;h.id </p>
<pre><code>//多对多的关系映射
private List&lt;User&gt; users;

public List&lt;User&gt; getUsers() &#123;
    return users;
&#125;

public void setUsers(List&lt;User&gt; users) &#123;
    this.users = users;
&#125;
</code></pre>
<hr>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.sqtian.dao.IRoleDao">
    <resultMap id="roleMap" type="com.sqtian.domain.Role">
        <id property="roleId" column="rid"></id>
        <result property="roleName" column="role_name"></result>
        <result property="roleDesc" column="role_desc"></result>
        <collection property="users" ofType="User">
            <id property="id" column="id"></id>
            <result property="name" column="name"></result>
            <result property="age" column="age"></result>
            <result property="weight" column="weight"></result>
            <result property="height" column="height"></result>
        </collection>
    </resultMap>

<pre><code>&lt;select id=&quot;findAll&quot; resultMap=&quot;roleMap&quot;&gt;
    select h.*,r.id as rid,r.role_name,r.role_desc from role r
    left outer join user_role ur on r.id=ur.rid
    left outer join hero h on ur.uid=h.id
&lt;/select&gt;
</code></pre>
</mapper>

<hr>
<pre><code>@Test
public void testFindAll()&#123;
    //5.执行查询所有的方法
    List&lt;Role&gt; roles = roleDao.findAll();
    for (Role role : roles) &#123;
        System.out.println(&quot;每一个角色的信息&quot;);
        System.out.println(role);
        System.out.println(role.getUsers());
    &#125;
&#125;
</code></pre>
<hr>
<p>多对多<br>查询用户获取角色信息<br>select h.*,r.id as rid,r.role_name,r.role_desc from hero h<br>left outer join user_role ur on h.id&#x3D;ur.uid<br>left outer join role r on ur.rid&#x3D;r.id </p>
<pre><code>//多对多关系映射
private List&lt;Role&gt; roles;

public List&lt;Role&gt; getRoles() &#123;
    return roles;
&#125;

public void setRoles(List&lt;Role&gt; roles) &#123;
    this.roles = roles;
&#125;
</code></pre>
<hr>
<pre><code>    &lt;collection property=&quot;roles&quot; ofType=&quot;Role&quot;&gt;
        &lt;id property=&quot;roleId&quot; column=&quot;rid&quot;&gt;&lt;/id&gt;
        &lt;result property=&quot;roleName&quot; column=&quot;role_name&quot;&gt;&lt;/result&gt;
        &lt;result property=&quot;roleDesc&quot; column=&quot;role_desc&quot;&gt;&lt;/result&gt;
    &lt;/collection&gt;
    
</code></pre>
<hr>
<pre><code>@Test
public void testFindAllRoles()&#123;
    //5.执行查询所有的方法
    List&lt;User&gt; users = userDao.findAllRoles();
    for (User user : users) &#123;
        System.out.println(&quot;---每个用户的信息---&quot;);
        System.out.println(user);
        System.out.println(user.getRoles());
    &#125;
&#125;
</code></pre>
<hr>
<h2 id="JNDI-数据源"><a href="#JNDI-数据源" class="headerlink" title="JNDI 数据源"></a>JNDI 数据源</h2>
                
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